Complex Electron Transfer Pathway at a Microelectrode Captured by in Situ Nanospectroscopy

Abstract : In the quest for analytical tools which enable the characterization of materials at the nanoscale and under the condition of their operation (in situ, operando), the emerging tip-enhanced Raman spectroscopy (TERS) now enters the spotlight. We demonstrate in this work that a TERS tip can be functionalized and partially insulated to be used as a microelectrode enabling electrochemical substrate enhanced Raman sectroscopy (EC-SERS) at a single hotspot. This “SERS at a tip” experiment enables one to capture the electrochemical transformation of a molecular layer self-assembled on a tapered gold microelectrode. The proposed setup and protocol open new perspectives in the characterization and development of complex redox architectures for molecular devices.
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Thomas Touzalin, Suzanne Joiret, Emmanuel Maisonhaute, Ivan T. Lucas. Complex Electron Transfer Pathway at a Microelectrode Captured by in Situ Nanospectroscopy. Analytical Chemistry, American Chemical Society, 2017, 89 (17), pp.8974 - 8980. ⟨10.1021/acs.analchem.7b01542⟩. ⟨hal-01592672⟩

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